It's not the codecs that were multithreaded in this release. Pretty much all modern codecs are already multithreaded. What they decided to parallelize is ffmpeg

It's not the codecs that were multithreaded in this release. Pretty much all modern codecs are already multithreaded. What they decided to parallelize is ffmpeg itself. You know, the filter graphs and such. They didn't do anything to the codecs themselves.